US6052236A - Light source equipment optical scanner and data reading apparatus using the same - Google Patents

Light source equipment optical scanner and data reading apparatus using the same Download PDF

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Publication number
US6052236A
US6052236A US09/099,103 US9910398A US6052236A US 6052236 A US6052236 A US 6052236A US 9910398 A US9910398 A US 9910398A US 6052236 A US6052236 A US 6052236A
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US
United States
Prior art keywords
light source
single lens
light
source equipment
reading apparatus
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Expired - Fee Related
Application number
US09/099,103
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English (en)
Inventor
Akio Nakasuji
Toshihiro Yoshioka
Motonobu Yoshikawa
Yoshiharu Yamamoto
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMOTO, YOSHIHARU, YOSHIKAWA, MOTONOBU, NAKASUJI, AKIO, YOSHIOKA, TOSHHIRO
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0085—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with both a detector and a source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0966—Cylindrical lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces

Definitions

  • the present invention relates to light source equipment which converts light outgoing from a light source such as a semiconductor laser to a light beam having a required distribution light intensity, and in particular it relates to light source equipment, an optical scanner and data reading apparatus for which it is necessary to provide a light beam whose beam diameter in its optical axis direction is unchanged.
  • a bar code reader which is able to read bar code information has widely been used for commodity control, etc. It is requested that in a current handy type laser bar code reader such an optical system is employed in which the 1/e 2 diameter of a light intensity distribution on the scanning surface is greater in a direction (subscanning direction) orthogonal to the main scanning direction that in a scanning direction (main scanning direction), and with little change in the beam diameter in the optical axis direction is a little. According to a laser bar code reader which satisfies such requirements, it is possible to read a bar code recorded with long lines in the subscanning direction in a wide range in the optical axis direction and also possible to attempt to decrease noise.
  • the astigmatic interval is corrected by using a cylindrical lens in the U.S. Pat. Nos. 4,253,735, 5,081,639, etc., a prism in Japanese Laid-open Patent Publication No. 110,009 of 1994, and a scanning mirror having a refracting power in Japanese Laid-open Patent Publication No. 55,178 of 1996.
  • the present invention was developed in view of the abovementioned situations, and it is therefore an object of the invention to provide light source equipment, an optical scanner and data reading apparatus which are able to achieve the downsizing thereof and to reduce the production cost with changes in the beam diameter with the optical axis direction suppressed, and to read information such as bar codes recorded with long lines in the subscanning direction in a wide range in the optical axis direction.
  • Light source equipment of the present invention comprises light source and an anamorphic single lens which has different refracting powers in the respective directions.
  • one direction where the beam diameter of a light beam emitted from the light source equipment is smaller is "x" direction
  • the other direction, orthogonal to the "x" direction, where the beam diameter is greater is "y” direction
  • the anamorphic single lens satisfies the following conditional equation where the focal length in the x direction is fx, the focal length in the y direction is fy, and the half angular divergence of radiant intensity of light beams from the light source is ⁇ y.
  • the change in the beam diameter in the y direction of the optical axis direction is increased, and if the [2 ⁇ fy ⁇ tan ( ⁇ y/2)] is greater than the upper end thereof, the beam diameter is increased as a whole although it is possible to make the change of the beam diameter smaller. According to the invention, it is possible to prevent the change of the y direction beam diameter from becoming greater and the entire beam from becoming larger.
  • Light source equipment is provided with a light source having different angles of radiation in the x and y directions orthogonal to each other, and an anamorphic single lens, having different refracting powers in the respective orthogonal directions, into which light beams are made incident from the light source.
  • the abovementioned light source meets a conditional equation of ⁇ y ⁇ x where the half angular divergence of the radiant intensity in the x direction is ⁇ x and the half angular divergence of the radiant intensity in the y direction is ⁇ y, and the abovementioned anamorphic single lens is such that the incidence surface thereof has a negative refracting power in the y direction and is a toric surface having a positive refracting power in the x direction, and if the focal length in the x direction is fx and that in the y direction is fy, the same lens meets the following conditional equation.
  • the focal length fx in the x direction is made independently from that in the y direction, it is possible to improve the optical utilization efficiency while meeting the beam diameter, in comparison with a lens constructed of a cylindrical surface and an axial symmetry aspheric surface.
  • FIG. 1 is a configurational view of light source equipment according to a first embodiment of the invention
  • FIGS. 2A and 2B are graphs showing changes in the beam diameter according to the first numerical example
  • FIGS. 3A and 3B are graphs showing changes in the beam diameter according to the second numerical example
  • FIGS. 4A and 4B are graphs showing changes in the beam diameter according to the third numerical example.
  • FIG. 5 is a configurational view of light source equipment according to a second embodiment of the invention.
  • FIG. 6 is a graph showing changes in the beam diameter according to the fourth numerical example.
  • FIG. 7 is a configuration view of an optical scanner according to a third embodiment of the invention.
  • FIG. 8 is a configurational view of data reading apparatus according to a fourth embodiment of the invention.
  • FIG. 1 is a configurational view of light source equipment according to a first embodiment of the invention.
  • This embodiment is a design example which aims at satisfying the conditions that the beam diameter (1/e 2 intensity) in the x direction is 0.4 mm or less and the beam diameter in the y direction is from 0.4 mm through 1.2 mm in a range of about 170 mm in the optical axis direction.
  • 1 is a semiconductor laser
  • 2 is an anamorphic single lens, the emission surface of which is an axial symmetry aspheric surface on a cylindrical surface whose incidence surface has a refracting power in only the x direction
  • 3 is a circular lens stop in which the beam diameter in the x direction is able to meet the required performance.
  • the axial symmetry aspheric surface profile is expressed in the following equation where a sag from the top of a plane at a distance p (mm) from the symmetrical axis is z (mm) with the advancement direction of a light beam made positive. ##EQU1##
  • the emission light beam in the x direction and emission light beam in the y direction are slightly divergence light.
  • FIG. 2A shows the beam diameter in the x direction with regard to the numerical example 1
  • FIG. 2B shows the beam diameter in the y direction with regard to the numerical example 1
  • FIG. 3A shows the beam diameter in the x direction with regard to the numerical example 2
  • FIG. 3B shows the beam diameter in the y direction with regard to the numerical example 2
  • FIG. 4A shows the beam diameter in the x direction with regard to the numerical example 3
  • FIG. 4B shows the beam diameter in the y direction with regard to the numerical example 3.
  • the light utilization efficiency of light beam passing through a lens stop is 25 through 42% in the numerical example 1, 23 through 40% in the numerical example 2, and 20 through 35% in the numerical example 3.
  • the shape of the incidence surface is made a cylindrical surface having a positive refracting power in the x direction, it may be a cylindrical surface having a negative refracting power in the y direction.
  • a light source equipment is constructed of a semiconductor laser and an anamorphic single lens, wherein an anamorphic single lens which meets the abovementioned conditional equation is disposed so that a divergent light beam from the light source is converted to a parallel beam or a divergence beam in the y direction and to a convergence beam in the x direction and a lens stop which obtains a required distribution light intensity is disposed. Therefore, it is possible to meet the conditions that the beam diameter (1/e 2 intensity) in the x direction is 0.4 mm or less and the beam diameter in the y direction is from 0.4 mm to 1.2 mm in a range of about 170 mm in the optical axis direction. That is, it is possible to obtain an appointed beam intensity profile in which the beam diameter is greater in the y direction than in the x direction in a required optical axis range.
  • the anamorphic single lens surface profile is constructed so that its incidence surface is made a cylindrical surface having a positive refracting power in only the x direction or a cylindrical surface having a negative refracting power in only the y direction and its emission surface is made an axial symmetry aspheric surface, it is possible to produce light source equipment having the abovementioned excellent performance characteristics at a comparatively low cost.
  • the incidence surface is made a cylindrical surface
  • the emission surface is made an axial symmetry aspheric surface and the emission surface is made to have a great refracting power, wherein the out-of-axis performance can be improved.
  • the light source is a semiconductor laser, it has different angles of radiation in the x and y directions, since ⁇ y ⁇ x is established where the half angular divergence of the radiant intensity in the x direction is ⁇ x (deg.), and that in the y direction is ⁇ y (deg.), the light utilization efficiency can be improved.
  • FIG. 5 is a configurational view of a light source device according to a second preferred embodiment of the invention.
  • This embodiment is a design example which aims at meeting the conditions that the beam diameter (1/e 2 intensity) in the x direction is 0.4 mm or less and the beam diameter in the y direction is from 0.4 mm through 1.2 mm in a range of about 170 mm in the optical axis direction.
  • 11 is a semiconductor laser
  • 12 is an anamorphic single lens having a toric surface, the incidence surface of which has a refracting power which is positive in the x direction and negative in the y direction and the emission surface of which has a refracting power which is positive in the x direction and negative in the y direction
  • 13 is a circular lens stop disposed so that the beam diameter in the x direction meets a required performance.
  • Table 4 and Table 5 show detailed numerical examples of an anamorphic single lens, wherein fx is a focal length (mm) in the x direction; fy is a focal length (mm) in the y direction; RDx1 is a radius (mm) in the x direction on the incidence surface; RDy1 is a radius (mm) in the y direction on the incidence surface; CC1 is a conical constant of the radius in the x direction on the incidence surface; RDx2 is a radius (mm) in the x direction on the emission surface; RDy2 is a radius (mm) in the y direction on the emission surface; CC2 is a conical constant in the y direction on the emission surface; TH is the center thickness (mm); WD is an operating distance including cover glass 0.25 mm thick having a refractive index of 1.49; D is a range (mm) from the lens emission surface to the lens stop; APw is a lens stop diameter (mm); ⁇ is a design wavelength (mm)
  • the toric profile of the incidence surface is a saddle type toric surface which is expressed by the following expression in which a sag from the top in the x-y coordinate system, in which the surface top is made the origin, is z (mm) for which the advancement direction of light beam is made positive.
  • the emission beam in the x direction is a convergence light
  • the emission beam in the y direction is slightly divergence light
  • FIG. 6 shows the beam diameter in the x direction, and that in the y direction according to the numerical example 4. Taking the unevenness in the angle of radiation into consideration, the light utilization efficiency of light beam passing through the lens stop is 31 to 50% for the numerical example 4 and 38 to 60% for the numerical example 5. Therefore, the light utilization efficiency of the second embodiment is higher than that of the first embodiment. Furthermore, although the emission surface is made a toric surface, an axial symmetry aspheric surface may be acceptable, depending on some specifications.
  • the profile of the anamorphic single lens is constructed so that its incidence surface is a toric surface having a negative refracting power in the y direction and a positive refracting power in the x direction and its emission surface is a toric surface having a positive refracting power in the y direction, it is possible to design the focal length fx in the x direction independently from that in the y direction. Therefore, it is possible to improve the light utilization efficiency 10 to 30% in the case of the abovementioned numerical examples, in comparison with a lens constructed of a cylindrical surface and an axial symmetry aspheric surface.
  • FIG. 7 is a configurational view of an optical scanner according to a third preferred embodiment of the invention.
  • 21 is light source equipment illustrated in the first preferred embodiment and 22 is a scanning mirror for scanning with a light beam in the x direction.
  • This equipment is optical scanning equipment which meets the conditions that, with respect to the required distribution of light intensity on a scanning surface, the beam diameter (1/e 2 intensity) in the x direction is 0.4 mm or less and the beam diameter in the y direction is 0.4 mm to 1.2 mm in a range of about 170 mm in the optical axis direction.
  • the intensity distribution differs in the orthogonal direction on the scanning surface, wherein even though the position of the scanning surface changes in the optical axis direction, such an effect can be obtained, by which the change in the beam diameter can be reduced and become smaller.
  • FIG. 8 is a configurational view of a data reading apparatus according to a fourth preferred embodiment of the invention.
  • 31 is an optical scanner illustrated in the third preferred embodiment; 32 is a recorded bar code; and 33 is a sensor composed of a light condenser optical system and an optical sensor.
  • the bar code 32 is read by scanning it with a light beam in the x direction with the lengthwise direction of the bar code coincident with the y direction, it is possible to easily read data since the range is wide, which meets the conditions that the beam diameter (1/e 2 intensity) in the x direction is 0.4 mm or less and the beam diameter in the y direction is 0.4 mm to 1.2 mm.
  • the fourth preferred embodiment thus constructed, it is possible to scan with a light beam having different light intensities in the respective directions, which is optimal to read data on the information recorded surface such as a bar code, etc., and furthermore, even though the position of the information recorded surface in the optical axis direction is changed, it is possible to read data with errors minimized since the beam diameter change is slight.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Mechanical Optical Scanning Systems (AREA)
US09/099,103 1997-06-19 1998-06-18 Light source equipment optical scanner and data reading apparatus using the same Expired - Fee Related US6052236A (en)

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JP17896497A JP3435311B2 (ja) 1997-06-19 1997-06-19 情報読み取り装置
JP9-178964 1997-06-19

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US (1) US6052236A (fr)
EP (1) EP0886162B1 (fr)
JP (1) JP3435311B2 (fr)
CN (1) CN1163775C (fr)
DE (1) DE69804055T2 (fr)
TW (1) TW535006B (fr)

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US6195315B1 (en) * 1997-07-11 2001-02-27 Ricoh Company, Ltd. Optical disk apparatus compatible with different types of mediums
US6275318B1 (en) * 1998-06-26 2001-08-14 Asahi Kogaku Kogyo Kabushiki Kaisha Linear imaging lens element for a scanning optical system
US20020120932A1 (en) * 2001-02-28 2002-08-29 Schwalb Eddie M. Omni menu for an audio/visual network
US6478452B1 (en) * 2000-01-19 2002-11-12 Coherent, Inc. Diode-laser line-illuminating system
US20030048736A1 (en) * 1997-07-11 2003-03-13 Yoshitaka Takahashi Opitical pickup apparatus compatible with different types of optical recording mediums
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US20030226895A1 (en) * 2002-06-11 2003-12-11 Hand Held Products, Inc. Long range optical reader
US20040020990A1 (en) * 2002-06-04 2004-02-05 Havens William H. Optical reader having a plurality of imaging modules
US20040035933A1 (en) * 2002-06-11 2004-02-26 Havens William H. Long range optical reader
US6781945B2 (en) 2000-10-13 2004-08-24 Matsushita Electric Industrial Co,. Ltd. Optical head and optical disc apparatus for focusing a collimated laser beam
US20040195328A1 (en) * 1999-10-04 2004-10-07 Welch Allyn Data Collection Inc. Imaging module for optical reader
US20050279836A1 (en) * 2002-06-04 2005-12-22 Havens William H Optical reader having a plurality of imaging modules
US20060176921A1 (en) * 2003-07-09 2006-08-10 Tetsuo Ueda Semiconductor laser device
US20070153392A1 (en) * 2005-01-21 2007-07-05 Meritt Reynolds Apparatus and method for illumination of light valves
US20090236424A1 (en) * 1999-10-04 2009-09-24 Hand Held Products, Inc. Image sensor based optical reader
US20110032725A1 (en) * 2008-04-18 2011-02-10 Fumio Nagai Optical Module and Optical Unit
US8561903B2 (en) 2011-01-31 2013-10-22 Hand Held Products, Inc. System operative to adaptively select an image sensor for decodable indicia reading
US8596542B2 (en) 2002-06-04 2013-12-03 Hand Held Products, Inc. Apparatus operative for capture of image data
US8608071B2 (en) 2011-10-17 2013-12-17 Honeywell Scanning And Mobility Optical indicia reading terminal with two image sensors
US20150112538A1 (en) * 2012-06-07 2015-04-23 Samsung Electronics Co., Ltd. Obstacle sensing module and cleaning robot including the same
US20160025611A1 (en) * 2014-07-22 2016-01-28 Sysmex Corporation Flow cytometer, particle analyzer, and flow cytometric method
US20170227760A1 (en) * 2016-02-04 2017-08-10 Hand Held Products, Inc. Beam shaping system and scanner
US20190121128A1 (en) * 2016-04-20 2019-04-25 Nippon Seiki Co., Ltd. Head-up display device

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US6494371B1 (en) 2000-03-09 2002-12-17 Coherent, Inc. Diode-laser light projector for illuminating a linear array of light modulators
DE10036787A1 (de) * 2000-07-28 2002-02-07 Lissotschenko Vitalij Anordnung und Vorrichtung zur optischen Strahltransformation
US7016393B2 (en) 2003-09-22 2006-03-21 Coherent, Inc. Apparatus for projecting a line of light from a diode-laser array
US7265908B2 (en) 2005-12-19 2007-09-04 Coherent, Inc. Apparatus for projecting a line of light from a diode-laser array
US8243111B2 (en) * 2007-04-26 2012-08-14 Panasonic Corporation Optical disc label printer, thermosensitive recording printer and thermosensitive recording method
CN103176226A (zh) * 2012-11-03 2013-06-26 西安华科光电有限公司 用于对半导体激光光束整形的匀光异形透镜、匀光激光光源及光学系统
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US7088645B2 (en) 1997-07-11 2006-08-08 Ricoh Company, Ltd. Optical pickup apparatus compatible with different types of optical recording mediums
US6272098B1 (en) 1997-07-11 2001-08-07 Ricoh Company, Ltd. Optical disk apparatus compatible with different types of mediums and comprising optical path separating means
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US7680015B2 (en) 1997-07-11 2010-03-16 Ricoh Company, Ltd. Optical disk apparatus compatible with different types of mediums adapted for different wavelengths
US20030048736A1 (en) * 1997-07-11 2003-03-13 Yoshitaka Takahashi Opitical pickup apparatus compatible with different types of optical recording mediums
US7403453B2 (en) 1997-07-11 2008-07-22 Ricoh Company, Ltd. Optical disk apparatus compatible with different types of mediums adapted for different wavelengths
US20080037399A1 (en) * 1997-07-11 2008-02-14 Yoshitaka Takahashi Optical disk apparatus compatible with different types of mediums adapted for different wavelengths
US20060221799A1 (en) * 1997-07-11 2006-10-05 Yoshitaka Takahashi Optical disk apparatus compatible with different types of mediums
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TW535006B (en) 2003-06-01
EP0886162A2 (fr) 1998-12-23
CN1205445A (zh) 1999-01-20
EP0886162A3 (fr) 2000-01-12
DE69804055D1 (de) 2002-04-11
EP0886162B1 (fr) 2002-03-06
DE69804055T2 (de) 2002-07-18
JPH1114922A (ja) 1999-01-22
CN1163775C (zh) 2004-08-25
JP3435311B2 (ja) 2003-08-11

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